IRPLLNR3 查看數據表（PDF） - International Rectifier

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IRPLLNR3

Universal Input Linear Fluorescent Ballast using the IR2167

International Rectifier 

IRPLLNR3

Figure 4 shows a plot of the half-bridge oscillation frequency as a function of time for all of the normal

modes of operation: Preheat mode, Ignition Ramp mode and Run mode. As shown in Figure 4 there

is an initial startup frequency that is much higher than the steady state Preheat mode frequency that

lasts for only a short duration. This is done to ensure that the initial voltage appearing across the lamp

at the startup of oscillation does not exceed the minimum lamp ignition voltage. If, at the initiation of

oscillation of the half-bridge, the voltage across the lamp is large enough, a visible flash of the lamp

occurs which should be avoided. This in effect is a cold strike of the lamp, which could shorten the

life of the lamp. Figure 5 shows the lamp voltage without the high initial startup frequency while Figure

6 shows the lamp voltage with the high initial frequency startup.

fosc

fPreheat

fRun

fIgnition

t

preheat

ignition

run

Figure 4: Oscillator frequency versus time, Normal operating conditions

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